Interactions and screening in gated bilayer graphene nanoribbons

Abstract

The effects of Coulomb interactions on the electronic properties of bilayer graphene nanoribbons (BGNs) covered by a gate electrode are studied theoretically. The electron density distribution and the potential profile are calculated self-consistently within the Hartree approximation. A comparison to their single-particle counterparts reveals the effects of interactions and screening. Due to the finite width of the nanoribbon in combination with electronic repulsion, the gate-induced electrons tend to accumulate along the BGN edges where the potential assumes a sharp triangular shape. This has a profound effect on the energy gap between electron and hole bands, which depends nonmonotonously on the gate voltage and collapses at intermediate electric fields. We interpret this behavior in terms of interaction-induced warping of the energy dispersion.

6 pages, 4 figures

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Cited by in corpus (5)

• Renormalization group aspects of graphene
• Effect of Coulomb interactions on the physical observables of graphene
• Spectrum of pi electrons in bilayer graphene nanoribbons and nanotubes: an analytical approach
• Impurity and edge roughness scattering in armchair graphene nanoribbons: Boltzmann approach
• Topological phases and Majorana states in screened interacting quantum wires